Accumulation of propionic acid during consecutive batch anaerobic digestion of commercial food waste

Capson-Tojo, Gabriel; Ruiz, Diane; Rouez, Maxime; Crest, Marion; Steyer, Jean‐Philippe; Bernet, Nicolas; Delgenès, Jean-Philippe; Escudié, Renaud

doi:10.1016/j.biortech.2017.08.149

Cited by 91 publications

(37 citation statements)

References 45 publications

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“…, this VFA was consumed significantly faster and reached lower maximum concentrations in the reactors supplemented with biochar, which led to faster methane production during the first few days. Regarding the total time for consumption of HPr (the most recalcitrant VFA to be degraded, in agreement with previous FW AD studies) ranged from 18.9 to 23.0 days. As shown in Fig.…”

Section: Resultssupporting

confidence: 90%

“…Geobacter species) onto its surface . HAc can be directly oxidized through DIET and its degradation might have favored that of HPr due to lower HAc and hydrogen/formate concentrations . The aforementioned hypotheses (favored biofilm formation and DIET occurrence) must be tested and validated by analyzing deeply the microbial communities attached to the biochar, as well as the properties of the biochar used.…”

Section: Resultsmentioning

confidence: 99%

“…The continuous reactors were inoculated with digestate from an industrial plant treating different organic streams at high TAN/FAN concentrations (5.04 g TAN l −1 ; 615 mg FAN l −1 ). Thus, it was assumed that the microorganisms would be adapted to high TAN/FAN levels associated with FW AD . The TS content of the inoculum was 5.81 ± 0.02%, with a proportion of volatile solids (VS) of 59.13 ± 0.08%.…”

Section: Methodsmentioning

confidence: 99%

“…No sulfur was detected. A more extensive characterization and a deeper discussion of the results can be found in Capson‐Tojo et al …”

Section: Methodsmentioning

confidence: 99%

“…The pilot reactors consisted of jacketed cylindrical vessels made of stainless steel that had inner stirring blades to provide continuous agitation. A more detailed description of the reactors can be found elsewhere . The experiments lasted for 196 days.…”

Section: Methodsmentioning

confidence: 99%

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Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Capson-Tojo

Girard

Rouez

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Although anaerobic digestion is a promising alternative for the valorization of complex substrates such as food waste, this process is yet to be optimized and options for its stabilization must be developed. This study assessed for the first time if the combined addition of biochar and trace elements in the form of an industrial FeCl3 solution could serve as a method for stabilizing food waste anaerobic digestion. Both batch and long‐term semi‐continuous reactors were run. RESULTS Results from batch reactors demonstrated that supplementation of both biochar (10–100 g L−1) and trace elements (FeCl3; 0.1–0.2 g Fe L−1) favored the digestion kinetics. Their addition improved the maximum methane production rates (from 897 up to 1494 mL day−1) and the average daily methane production rates (from 298 up to 369 mL day−1), related to acetate and propionate consumption, respectively. Continuous reactors confirmed the batch results, with higher methane production rates (up to 1.75 L L−1 day−1) and lower concentrations of acetate and propionate when biochar and trace elements (FeCl3) were added. CONCLUSION Addition of biochar and industrial FeCl3 favored the digestion kinetics, improving volatile fatty acid consumption and methane production rates. These materials appear as an economically‐feasible alternative for stabilizing the valorization of food waste at industrial scale. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…No sulfur was detected. A more extensive characterization and a deeper discussion of the results can be found in Capson‐Tojo et al …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Capson-Tojo

Girard

Rouez

et al. 2018

J of Chemical Tech & Biotech

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Modeling a propionate‐oxidizing syntrophic coculture using thermodynamic principles

Leurent

Moscoviz

2022

Biotech & Bioengineering

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A coculture of Syntrophobacter fumaroxidans and Methanospirillum hungatei was modeled using four biokinetic models, which only differed by the functions used to describe the growth yields (dynamic or constant) and the hydrogen inhibition function (noncompetitive or based on thermodynamics). First, a batch experiment was used to train the model and analyze the fitted parameters. Two fitting procedures were followed by minimizing the error on different indicators. Second, a chemostat experiment was used as a test data set to assess the predictive power of the models. Overall, the four models were able to accurately fit the train data set following both fitting procedures. However, some parameters fitted with the ADM1-like model differed significantly from values reported in the literature and were dependent on the fitting procedure. When applied to the test data set it systematically resulted in positive Gibbs free energy changes values for propionate oxidation, in contradiction with the second law of thermodynamics. On the opposite, the parameters fitted with model including both a thermodynamic-based inhibition function and a dynamic computation of growth yields were more consistent with values reported in the literature and repeatable whatever the fitting procedure. The results highlight the potential of implementing thermodynamic-based functions in biokinetic models.

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Waste activated sludge treatment in an anaerobic dynamic membrane bioreactor at varying hydraulic retention time: Performance monitoring and microbial community analysis

et al. 2020

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In this study, the variations in system performance and microbial community composition when treating waste activated sludge without prior chemical or physical pretreatment in anaerobic systems is examined. Two lab-scale digesters, namely anaerobic dynamic membrane bioreactor (AnDMBR) and continuously stirred tank reactor (CSTR), were operated and maintained under mesophilic conditions at varying hydraulic retention times (10-25 days). Decreasing the hydraulic retention time (HRT) affected the methane yield (MY) and methane production rate (MPR) proportionally in both systems. The AnDMBR's maximum MY of 252 mL CH 4 /g-VS and MPR of 0.73 L/L/d were 25% and 34% higher than those obtained using the CSTR, respectively. Moreover, a decrease in HRT was accompanied by accumulation of butyric acid in the CSTR, which caused further performance deterioration. In both systems, AnDMBR's dynamic membrane acted as an added layer preventing methanogen wash-out and retaining the essential microorganisms for stable sludge treatment. Dominance in the microbial composition shifted from a strict acetoclastic to a mixed acetoclastic and hydrogenotrophic methanogenic community and that a decrease in the ration of Bacteroidetes to Firmicutes was associated with the increased MY.

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Accumulation of propionic acid during consecutive batch anaerobic digestion of commercial food waste

Cited by 91 publications

References 45 publications

Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Modeling a propionate‐oxidizing syntrophic coculture using thermodynamic principles

Waste activated sludge treatment in an anaerobic dynamic membrane bioreactor at varying hydraulic retention time: Performance monitoring and microbial community analysis

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Accumulation of propionic acid during consecutive batch anaerobic digestion of commercial food waste

Cited by 91 publications

References 45 publications

Addition of biochar and trace elements in the form of industrial FeCl3 to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Addition of biochar and trace elements in the form of industrial FeCl3 to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Modeling a propionate‐oxidizing syntrophic coculture using thermodynamic principles

Waste activated sludge treatment in an anaerobic dynamic membrane bioreactor at varying hydraulic retention time: Performance monitoring and microbial community analysis

Contact Info

Product

Resources

About

Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

Addition of biochar and trace elements in the form of industrial FeCl₃ to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study